Choosing the right bearings is crucial for smooth, fast, and durable spinner performance. This guide highlights five reliable options from well-known brands that are popular for fidget spinners and related small machinery. Each product offers low friction, solid construction, and compatibility with standard 608 and MR137 sizes, making upgrades or replacements straightforward for hobbyists and DIY projects alike.
| Product | Brand | Diameter (mm) | Type | Notes |
|---|---|---|---|---|
| 20 Pcs 608 Ball Bearings | SACKORANGE | 22 outer / 8 inner | 608 Open | High-Quality 20-Pack; versatile for spinners and DIY projects |
| Antrader 10Pcs 608 | Antrader | 22 outer / 8 inner | 608 Open | High precision; low friction for fast spins |
| SHKI 20 Pcs 608 2RS | SHKI | 22 outer / 8 inner | 608 2RS | Double rubber sealed; durable for high-load use |
| 16 Pack Fidget Spinner Bearing Set | NiArt | 13 outer / 7 inner | MR137 | Includes caps; high-speed precision for spinners |
| 20 Pack Fidget Spinner Bearing Set | NiArt | 13 outer / 7 inner | MR137 | Sealed bearings with caps; good for upgrades |
Note: All products listed are compatible with standard 608 and MR137 bearing sizes. The selections emphasize low friction, robust materials, and ready compatibility with common spinner designs and DIY projects.
20 Pcs 608 Ball Bearings – High Precision
These SACKORANGE 608 bearings come in a 20-pack, offering unsealed/open-type 608 steel ball bearings with measurements of 8mm inner diameter, 22mm outer diameter, and 7mm thickness. Designed for smooth, high-speed rotation with low friction, the set is ideal for fidget spinners as well as other fast-moving applications. The chromium steel construction provides durability and strong radial load support, ensuring longevity under continuous use. Their open type design favors easy lubrication and quick maintenance, making them a solid upgrade or replacement option for spinner enthusiasts.
Antrader 10Pcs 608 Steel Ball Bearings
The Antrader 608 bearings come in a 10-pack with open type design and unsealed balls, offering high rotation speed with reduced friction, vibration, and noise. Each bearing measures 8mm ID, 22mm OD, and 7mm thickness, making them a suitable fit for most fidget spinners and related micro-mechanics. The open construction simplifies lubrication and maintenance while delivering solid performance for everyday use and DIY projects.
SHKI 20 Pcs 608 2RS Ball Bearings
SHKI offers 20 bearings of the 608 2RS type, featuring double rubber seals for enhanced protection against dust and moisture. The bearings are manufactured from bearing steel noted for hardness and toughness, delivering durability in each rotation. They are designed for small machinery and devices requiring precise, high-load performance—fitting for skates, scooters, and especially fidget spinners that demand dependable longevity and smoother spins.
16 Pack Fidget Spinner Bearing and Cap Set
NiArt’s 16-pack MR137 bearings come sealed on one side with blue plastic seals and include 16 pairs of black caps. The MR137 size is 7mm inner, 13mm outer, and 4mm thickness, with an emphasis on high-speed performance and durability. Made from stainless steel and plastic, these bearings are designed to resist deformation under heavy loads while delivering smooth operation and longevity for resin spinner projects and other small-scale mechanisms.
100 Pcs 608 Ball Bearings – High Precision
Although this option offers a bulk 100-pack of unsealed 608 bearings, it demonstrates the same core advantages: smooth rotation, low friction, and strong radial load support. The chromium steel construction ensures durability for repeated use across spinners and other quick-rotating devices. Bulk sets are convenient for project kits, classrooms, or repeated replacements in ongoing spinner builds.
NiArt Epoxy Resin Casting Kit: Clear Cap Bearings
NiArt’s epoxy resin casting kit includes 24 clear caps and 24 metal bearings designed for resin spinner projects. The MR137 bearings are sized to provide reliable rotation and compatibility with resin casts. Clear snaps integrate seamlessly with resin aesthetics, delivering a clean, polished look while maintaining smooth, high-speed performance for creative spinner designs.
Buying Guide: Key Purchase Considerations
- Bearing size and compatibility: Most fidget spinners use 608 (8x22x7 mm) or MR137 (7x13x4 mm) bearings. Confirm inner/outer diameters and thickness to ensure a proper fit with your spinner hub.
- Seals and lubrication: Open (unsealed) bearings are easier to lubricate and may spin faster initially, while sealed or shielded bearings (2RS) offer better dust and moisture protection for longer life.
- Material and construction: Chromium steel bearings offer durability and low friction, while stainless steel variants add corrosion resistance for humid environments or resin projects.
- Noise and vibration: Some bearings are engineered to minimize noise and vibration, which can affect comfort and spin duration. Consider open vs. sealed based on your tolerance and maintenance willingness.
- Cap compatibility: Some NiArt sets include caps that cover the bearings, influencing aesthetics and protection from debris. If your design requires caps, choose a set that includes them.
- Bulk versus single packs: For ongoing builds or classrooms, bulk packs reduce replacement frequency and unit cost, but ensure you actually need that many bearings.
- Application scope: While designed for fidget spinners, many of these bearings work well in skateboards, longboards, scooters, and DIY machines, expanding their utility beyond spinners.
All listed products are presented with objective specifications and intended for consumers seeking reliable, high-performance bearings for spinner projects and related devices. When selecting, balance size, sealing, material, and whether caps are included to match your specific design and maintenance preferences.